The Paul R. DesJardins collection documents DesJardins’s career as a programmer, with material dating from 1947 to 2003, and
the bulk from 1956 to 1993. A large portion of the collection is related to the development of the time-sharing system RUSH,
and to PL/I, the programming language used for RUSH. DesJardins was the principal designer of RUSH when he worked at Allen-Babcock
Computing. Also included is a smaller amount of material created and collected by DesJardins when he worked at North American
Aviation and Nucleus International. Lastly, the collection contains various publications collected by DesJardins that include
technical papers, newsletters, conference and seminar proceedings, manuals, reference guides, specifications, and promotional
Paul R. DesJardins is notable for his work as a programmer, particularly in aerospace applications, operating systems, time-sharing
systems, databases, and other industry applications and programs. He graduated from St. Louis University in 1948 with a bachelor’s
degree in aeronautical engineering, then studied numerical analysis at UCLA Extension. At the beginning of his career, DesJardins
worked in the aerospace industry doing application programming, aircraft design, flight testing, and trajectory analysis for
Chase Aircraft Company, Redstone Arsenal, the United States Army, and North American Aviation (NAA). DesJardins was with the
army from 1950 to 1953, where he worked in missile trajectory analysis, aircraft flight safety, maintenance, and parts procurement.
After the army, DesJardins was employed at NAA from 1954 to 1965 in the Missile Division, where he worked as the supervisor
of flight test data analysis, and as the director of the Computer Services Division. He was involved in space flight analysis,
celestial mechanics, lunar landing studies, and the NAA’s Hardware Committee. After leaving the NAA, DesJardins worked for
Allen-Babcock Computing (ABC) from 1965 to 1972 as the vice president of systems and programming. While at ABC, he was the
principal designer of RUSH (Remote Use of Shared Hardware), a time-sharing system for the IBM System/360 Model 50 that used
the PL/I language, and contributed to the development of other instructions and applications for a variety of industries.
DesJardins worked as a database application consultant from 1973 to 1986, then worked for Nucleus International (formerly
Marcus) into the 1990s. While at Nucleus, DesJardins co-designed a bit vector coding method that was patented as the Bit String
Compressor with Boolean Operation Processing Capability in 1991. Outside of work, DesJardins was active in the IBM user group
SHARE as a program chairman and board of directors member. He was also a national Association for Computing Machinery (ACM)
lecturer on application-specific programming in 1969. DesJardins passed away in 2007.
The Computer History Museum (CHM) can only claim physical ownership of the collection. Users are responsible for satisfying
any claims of the copyright holder. Requests for copying and permission to publish, quote, or reproduce any portion of the
Computer History Museum’s collection must be obtained jointly from both the copyright holder (if applicable) and the Computer
History Museum as owner of the material.